content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.Objects;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  
  /**
   * Map the downstream Subscriber into an upstream Subscriber.
   *
   * @param <T> the upstream value type
   * @param <R> the downstream value type
   */
  final class SoloLift<T, R> extends Solo<R> {
  
      final Solo<T> source;
  
      final Function<Subscriber<? super R>, Subscriber<? super T>> onLift;
  
      SoloLift(Solo<T> source, Function<Subscriber<? super R>, Subscriber<? super T>> onLift) {
          this.source = source;
          this.onLift = onLift;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super R> s) {
          Subscriber<? super T> parent;
  
          try {
              parent = Objects.requireNonNull(onLift.apply(s), "The onLift returned a null Subscriber");
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              EmptySubscription.error(ex, s);
              return;
          }
  
          source.subscribe(parent);
      }
  
  }
  